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When I was in 6th grade we were in the middle of math class working on something and all of the sudden all 30 of us (only kids) just sat up simultaneously we were all still for like 3 seconds and then started looking at each other still without talking. I still have no idea what actually happened but we all felt it, it felt like the air was somehow vibrating, and when I asked my friend later he also had the same feeling of low rumbling chill in his spine. About 5 seconds in to it the teacher finally realises something is going on and looks up to see 30 kids all looking at each other in complete silence. I remember a deep feeling in my guts that somehow resembled a de ja vu but unlike the normal de ja vu it didn't feel like it happened to ME before but to someone else who is both me and not ME. Then the teacher asked "is everything ok" and all the sudden all 30 of us gasped and started talking all together. Later on we all collectively reasoned that it had to have been a small earthquake because those are not unheard of where we lived and the teacher was old and probably didn't feel anything. When we asked the second class next to us if they felt the earth quake none of them had any idea what we were talking about.
Later that day I told my dad about the small earth quake we felt. And as I described the sensation to him he became very quite. He then asked me if we were on the second floor on the second class to the right. Which is exactly where we were. Now we live in a very tightly knit community/neighborhood, so I went to the same school as my dad and most of my friends were the kids of my dad's friends from the neighborhood.
30 years ago when my dad went to the same school the exact same thing happened to his class . With the exact same feeling of experiencing someone else's de ja vu who is both you and not you.